ios - 定时启动objective-c

Question

我想制作一个每小时播放声音的程序，但我卡住了。我需要一些帮助来解决问题，问题是我不知道如何告诉程序每小时播放声音。我正在尝试一些比较（我将日期设置为整数并与其他整数进行比较），但这似乎有效......有人可以帮忙吗？（例如：我希望 NSDate 播放我 az 13:00 的声音）很多谢谢

Answer 1

NSTimer is ok if you know the iOS app will be in the foreground when the timer expires. However to be more robust you'd need to use local nofications.

Answer 2

如果您想在指定时间播放声音而不让您的应用在前台运行，则必须使用通知：

UILocalNotification *localNotif = [[UILocalNotification alloc] init];
localNotif.fireDate = <some hour in the future>;
localNotif.repeatInterval = NSHourCalendarUnit;
localNotif.soundName = @"soundFile.caf";
localNotif.timeZone = [NSTimeZone defaultTimeZone];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
[localNotif release];

声音文件必须是您的应用程序主包的一部分，但您不能使用任意声音文件。

http://developer.apple.com/library/ios/#documentation/iphone/Reference/UILocalNotification_Class/Reference/Reference.html

Answer 3

Use NSTimer.

See Creating and Scheduling a Timer.

Answer 4

你需要的是一个：NSTimer

本教程可以提供帮助。

Answer 5

You could use NSTimer.

Setup NSTimer

NSTimer *timer = [[NSTimer alloc]initWithFireDate:<your_start_date> 
                     interval:(60 * 60)  
                     target:self 
                     selector:@selector(timerHandler:) 
                     userInfo:nil 
                     repeats:YES];

and write your handler..

-(void)timerHandler:(NSTimer*)timer{
 //play your sound here..
}

Answer 6

Try this..

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(myTimerMethod:) userInfo:nil repeats:YES];

-(void)myTimerMethod
{
//Play an Alarm
}